Support hardcoded-ldap-role-mapper LDAP Mapper

[cthiebault]

This would grant a specified Keycloak role to each Keycloak user linked with LDAP.
See documentation

It could look like this:

resource "keycloak_ldap_hardcoded_role_mapper" "role_mapper" {
  realm_id                = "${keycloak_realm.my-realm.id}"
  ldap_user_federation_id = "${keycloak_ldap_user_federation.my-ldap.id}"
  name                    = "my-role-mapper"
  role                    = "my-role"
}